2)My second question is about replication in general. Again I will suppose that server1 rebooted.

If I do (on server1)

show slave status;

I will get a "Read_Master_Log_Pos:" that does not match the output of "Position" :

(on server 2)
show master status;

Will the replication still work???

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What is important is that Slave_IO_Running and Slave_SQL_Running both show Yes.
The servers might not always be 100% in sync - depending on network load or server load it can take a few seconds until a server catches up.

I successfully build a load balanced + high availability server (currently in production) on 2 real servers running Xen (instead of having 4 servers...) with http, mysql, mail and dns based on many of your howtos...

Im almost done writing an howto about it, will post it on howtoforge when it will be completed but you can take a peak :

Just put up the howto on howtoforge last night (took me 3-4h formatting the tutorial from my website )...

Soon will start working on a better version with shared high availability NFS for mail & web files instead of rsync, more user friendly interface (DNS, mail config, etc) and vmware.

Its totally unrelated but i benchmarked the xen kernel with unixbench on 3 computers and I always get 50% of the score compared with the standard kernel. Do you think vmware would give better performance? Maybe unixbench is not a good real life benchmark?

Its totally unrelated but i benchmarked the xen kernel with unixbench on 3 computers and I always get 50% of the score compared with the standard kernel. Do you think vmware would give better performance? Maybe unixbench is not a good real life benchmark?

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Maybe with VMware ESX, but not with VMware Server. You might also want to try OpenVZ.